From b72db4005fe4bf4af16d1436abd3c9d3aac991d1 Mon Sep 17 00:00:00 2001 From: Kedareswara rao Appana Date: Wed, 6 Apr 2016 10:38:08 +0530 Subject: dmaengine: vdma: Add 64 bit addressing support to the driver This VDMA is a soft ip, which can be programmed to support 32 bit addressing or greater than 32 bit addressing. When the VDMA ip is configured for 32 bit address space the buffer address is specified by a single register (0x5C for MM2S and 0xAC for S2MM channel). When the VDMA core is configured for an address space greater than 32 then each buffer address is specified by a combination of two registers. The first register specifies the LSB 32 bits of address, while the next register specifies the MSB 32 bits of address. For example, 5Ch will specify the LSB 32 bits while 60h will specify the MSB 32 bits of the first start address. So we need to program two registers at a time. This patch adds the 64 bit addressing support to the vdma driver. Signed-off-by: Anurag Kumar Vulisha Signed-off-by: Kedareswara rao Appana Signed-off-by: Vinod Koul --- Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'Documentation/devicetree/bindings') diff --git a/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt b/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt index e4c4d47..a86737c 100644 --- a/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt +++ b/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt @@ -8,6 +8,8 @@ Required properties: - #dma-cells: Should be <1>, see "dmas" property below - reg: Should contain VDMA registers location and length. - xlnx,num-fstores: Should be the number of framebuffers as configured in h/w. +- xlnx,addrwidth: Should be the vdma addressing size in bits(ex: 32 bits). +- dma-ranges: Should be as the following . - dma-channel child node: Should have at least one channel and can have up to two channels per device. This node specifies the properties of each DMA channel (see child node properties below). @@ -41,8 +43,10 @@ axi_vdma_0: axivdma@40030000 { compatible = "xlnx,axi-vdma-1.00.a"; #dma_cells = <1>; reg = < 0x40030000 0x10000 >; + dma-ranges = <0x00000000 0x00000000 0x40000000>; xlnx,num-fstores = <0x8>; xlnx,flush-fsync = <0x1>; + xlnx,addrwidth = <0x20>; dma-channel@40030000 { compatible = "xlnx,axi-vdma-mm2s-channel"; interrupts = < 0 54 4 >; -- cgit v1.1